Java tutorial
//package com.java2s; public class Main { public static boolean isXmlNameStartChar(char chr) { // [4] NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | // [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | // [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF] // http://www.w3.org/TR/REC-xml/#NT-Name return Character.isLetter(chr) || chr == ':' || chr == '_' || isInRange(chr, 0xC0, 0xD6) || isInRange(chr, 0xD8, 0xF6) || isInRange(chr, 0xF8, 0x2FF) || isInRange(chr, 0x370, 0x37D) || isInRange(chr, 0x37F, 0x1FFF) || isInRange(chr, 0x200C, 0x200D) || isInRange(chr, 0x2070, 0x218F) || isInRange(chr, 0x2C00, 0x2FEF) || isInRange(chr, 0x3001, 0xD7FF) || isInRange(chr, 0xF900, 0xFDCF) || isInRange(chr, 0xFDF0, 0xFFFD) || isInRange(chr, 0x10000, 0xEFFFF); } public static boolean isInRange(char chr, int low, int high) { return ((int) chr >= low) && ((int) chr <= high); } }